Insulating oils :  for transformers and switchgear. 

 - London :  The Shell Petroleum Company,  1952. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lubricantes
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>621.892